Conditional operator
If the value of operand1 is 'true', the result of the conditional operation is the value of operand2. Operand3 is not evaluated.
If the value of operand1 is 'false', the result of the conditional operation is the value of operand3. Operand2 is not evaluated.
For example, the expression that follows performs a conditional test and selects either a data field or a constant depending on the test.
FIELDS=(3:13,IS_PACKED(16:4C)THEN 16:4P
ELSE 4P'0',19:*)
ELSE 4P'0',19:*)
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